From 341a7662cd3f54f954db521b167a1535deb61980 Mon Sep 17 00:00:00 2001
From: Paul Adenot <paul@paul.cx>
Date: Mon, 12 Jan 2026 15:59:35 +0100
Subject: [PATCH] Add explicit step for empty langs in install() algorithm

The prose already stated that install() should resolve to false when
langs is empty, but the algorithm steps didn't include an explicit check.
This aligns the algorithm with the prose description.

Fixes #174
---
 index.bs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/index.bs b/index.bs
index b28088a..458c5b5 100644
--- a/index.bs
+++ b/index.bs
@@ -408,6 +408,7 @@ See <a href="https://lists.w3.org/Archives/Public/public-speech-api/2012Sep/0072
 
     When invoked, run these steps:
     1. If the [=current settings object=]'s [=relevant global object=]'s [=associated Document=] is NOT [=fully active=], throw an {{InvalidStateError}} and abort these steps.
+    1. If {{SpeechRecognitionOptions/langs}} of <var>options</var> is an empty sequence, return a resolved {{Promise}} with false and abort these steps.
     1. If any <var>lang</var> in {{SpeechRecognitionOptions/langs}} of <var>options</var> is not a valid [[!BCP47]] language tag, throw a {{SyntaxError}} and abort these steps.
     1. If the on-device speech recognition language pack for any <var>lang</var> in {{SpeechRecognitionOptions/langs}} of <var>options</var> is unsupported, return a resolved {{Promise}} with false and skip the rest of these steps.
     1. Let <var>promise</var> be <a>a new promise</a>.